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Expired Canadian patentCanada

Data transfer unit

CA 1057409 A · Owner: Fujitsu Limited · Inventors: Suzuki, Masao; Moriya, Kunitoshi

CIPO record

Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

The invention disclosed is a data transfer system which is capable of transferring data at slow speed with respect to a central processing unit and writing or reading the data into or from a magnetic disk unit at high speed. A system is known which uses two memory units and with which reading and writing are performed alternately but the present invention requires only one memory unit. In the present invention serial data enters at on bit rate and leaves at another. Each bit of incoming data is distributed into several groups and a prescribed time delay is given to the bits of each group. The bits or each group are then assembled into a group having a bit rate different from that of the …

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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Granted June 26, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 26, 1996.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJune 26, 1979
Term endedJune 26, 1996
Patent numberCA 1057409 A
Classification (IPC)G06F5/06

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedJune 26, 1979Term endedJune 26, 1996

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.